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Actuators

a technology of actuators and actuators, applied in the direction of fluid couplings, couplings, machines/engines, etc., can solve the problems of poor ratio of actuator stroke to actuator length, difficult integration of rack and pinion actuators into existing land vehicle suspension systems, and relative long

Inactive Publication Date: 2008-08-14
BOARD OF RGT THE UNIV OF TEXAS SYST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The present actuators described in this patent are well-suited for use in off-road or on-road vehicles. They include a reversible hydraulic pump, a hydraulic cylinder assembly, and a hydraulic circuit. The actuators can produce axial motion without the need for check valves, pressure regulating valves, or actively controlled valves. They can be structurally integrated as a modular unit and include a fixed-volume hydraulic accumulator. The actuators can provide full four-quadrant operation and can be used in a suspension system.

Problems solved by technology

Although this combination rack and pinion based electromechanical actuator and supplemental spring works well, it is relatively long (poor ratio of actuator stroke to actuator length).
This makes the rack and pinion actuator difficult to integrate into existing land vehicle suspension systems.
In systems with high duty cycles, the conventional servo system offers low efficiency due to two major sources of losses.
The first source of energy loss is in the servo valve, where throttling action is lossy, reducing pressure by dissipating energy.
The second source of energy loss is in supply pressure regulation, typically accomplished by bleeding off or bypassing some of the flow to the reservoir to control the output pressure from the hydraulic pump.
However, this increased efficiency is at the expense of size, complexity and cost.

Method used

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Embodiment Construction

[0027]The terms “comprise” (and any form of comprise, such as “comprises” and “comprising”), “have” (and any form of have, such as “has” and “having”), “contain” (and any form of contain, such as “contains” and “containing”), and “include” (and any form of include, such as “includes” and “including”) are open-ended linking verbs. As a result, a system or method that “comprises,”“has,”“contains,” or “includes” one or more elements possesses those one or more elements, but is not limited to possessing only those one or more elements or steps. Likewise, an element of a system or method that “comprises,”“has,”“contains,” or “includes” one or more features possesses those one or more features, but is not limited to possessing only those one or more features. Furthermore, a structure that is configured in a certain way must be configured in at least that way, but also may be configured in a way or ways that are not specified.

[0028]The terms “a” and “an” are defined as one or more than one...

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Abstract

Actuators suited for use with, for example, vehicular suspension systems. In some embodiments, the present actuators include a reversible hydraulic pump configured to produce variable hydraulic pressure; a hydraulic cylinder assembly having a cylinder bore, and a piston positioned within the cylinder bore that is axially movable relative to the cylinder bore; and a hydraulic circuit hydraulically coupling the reversible hydraulic pump to the hydraulic cylinder assembly. In these embodiments, actuated axial motion of the piston relative to the cylinder bore is accomplished without the use of check valves, pressure regulating valves, or actively controlled valves.

Description

BACKGROUND[0001]1. Field[0002]The present invention relates generally to actuators, and more particularly to hydraulic actuator devices suited for use in land vehicle suspension systems.[0003]2. Description of Related Art[0004]The use of servo actuators to control motion in land vehicle suspension systems offers the potential for improving performance, especially for off road application. For example, developers of military vehicles have been particularly interested in this technology to enable faster movement of military vehicles over rough battlefield terrain. Active suspension systems provide a smoother ride and greater maneuvering stability in both off-road and on-road vehicles than passive suspension systems.[0005]Linear electromechanical actuators have been employed in active suspension system designs. Typical linear electromechanical actuators for active suspension systems consist of a rotary electric motor, an efficient means of providing mechanical advantage and converting ...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): F16D31/02
CPCF15B7/006B60G2202/416
Inventor BRESIE, DON
Owner BOARD OF RGT THE UNIV OF TEXAS SYST
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